U.S. patent application number 17/408351 was filed with the patent office on 2021-12-09 for oled panel lower part protection film, and organic light-emitting display apparatus comprising same.
The applicant listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Youngbin BAEK, Youngseo CHOI, Jinhyuk KIM, Sangshin KIM, Sangwoo LEE, Youngdon PARK.
Application Number | 20210384469 17/408351 |
Document ID | / |
Family ID | 1000005787215 |
Filed Date | 2021-12-09 |
United States Patent
Application |
20210384469 |
Kind Code |
A1 |
CHOI; Youngseo ; et
al. |
December 9, 2021 |
OLED PANEL LOWER PART PROTECTION FILM, AND ORGANIC LIGHT-EMITTING
DISPLAY APPARATUS COMPRISING SAME
Abstract
A lower part protection film for an OLED panel is provided. More
particularly, a lower part protection film for an OLED panel,
having a significantly improved recognition rate of an alignment
process, being capable of preventing generation of static
electricity through an antistatic treatment, and having excellent
adhesion to an OLED panel at the same time, and an organic
light-emitting display apparatus including the lower part
protection film for an OLED panel are provided.
Inventors: |
CHOI; Youngseo; (Yongin-si,
KR) ; KIM; Sangshin; (Asan-si, KR) ; KIM;
Jinhyuk; (Asan-si, KR) ; PARK; Youngdon;
(Asan-si, KR) ; BAEK; Youngbin; (Asan-si, KR)
; LEE; Sangwoo; (Asan-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-si |
|
KR |
|
|
Family ID: |
1000005787215 |
Appl. No.: |
17/408351 |
Filed: |
August 20, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
16478838 |
Jul 17, 2019 |
11108018 |
|
|
PCT/KR2018/000822 |
Jan 18, 2018 |
|
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17408351 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B32B 27/36 20130101;
C09J 7/30 20180101; C09J 11/06 20130101; B32B 7/06 20130101; B32B
37/12 20130101; C09J 5/02 20130101; B32B 27/08 20130101; H01L
51/5253 20130101; B32B 2255/10 20130101; C08K 5/3432 20130101; B32B
38/10 20130101; B32B 37/182 20130101; B32B 2255/26 20130101; C08K
2201/017 20130101; B32B 2457/206 20130101; B32B 2367/00 20130101;
B32B 7/12 20130101; H01L 51/004 20130101; C09J 2301/408 20200801;
B32B 37/02 20130101; C09J 2203/326 20130101; B32B 2405/00 20130101;
C09J 9/02 20130101; C09J 7/255 20180101; H01L 51/0067 20130101;
C09J 2433/00 20130101; C09J 2467/006 20130101 |
International
Class: |
H01L 51/52 20060101
H01L051/52; C09J 7/25 20060101 C09J007/25; C09J 7/30 20060101
C09J007/30; B32B 7/06 20060101 B32B007/06; B32B 7/12 20060101
B32B007/12; B32B 27/08 20060101 B32B027/08; B32B 27/36 20060101
B32B027/36; B32B 37/02 20060101 B32B037/02; B32B 37/12 20060101
B32B037/12; B32B 37/18 20060101 B32B037/18; B32B 38/10 20060101
B32B038/10; C09J 5/02 20060101 C09J005/02; C09J 9/02 20060101
C09J009/02; C09J 11/06 20060101 C09J011/06; H01L 51/00 20060101
H01L051/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 18, 2017 |
KR |
10-2017-0008519 |
Claims
1. A method of applying a lower part protection film for an OLED
panel, the method comprising: exfoliating a liner film from the
lower part protection film; attaching, to the OLED panel, a
base-carrier film, from which the liner film is exfoliated; and
exfoliating a carrier film from the base-carrier film attached to
the OLED panel, wherein the lower part protection film comprises:
the base-carrier film comprising a base film comprising a first
adhesive layer on an upper surface of a first base material and a
carrier film comprising a second adhesive layer adhered to a lower
surface of the first base material and a second base material
adhered to a lower surface of the second adhesive layer; and the
liner film adhered utilizing the first adhesive layer, wherein the
lower part protection film satisfies both Condition (1) and
Condition (2) below: (1) a reflectance of the lower part protection
film is 12 to 18% at a wavelength of 400 to 700 nm; and (2) a
reflectance ratio between the liner film and the base-carrier film
at a wavelength of 400 nm to 700 nm is 1:0.3 to 3.0.
2. The organic light-emitting display apparatus of claim 1, wherein
adhesion of the first adhesive layer, measured by using a
measurement method, is 250 gf/in or higher, wherein, in the
measurement method, the adhesive layer was adhered to glass, and
after 24 hours, adhesion of the adhesive layer was measured when
the adhesive layer was exfoliated at 180.degree. at a rate of 5 mm
per second.
3. An organic light-emitting display apparatus comprising a base
film and an OLED panel, wherein the OLED panel comprises a
substrate and an organic light-emitting device on the substrate,
wherein the base film comprises a base material and an adhesive
layer on an upper surface of the base material, and the base film
has a transmittivity of 85 to 98% and a haze of 0.2 to 1.0%.
4. The organic light-emitting display apparatus of claim 3, wherein
the adhesive layer comprises an antistatic agent.
5. The organic light-emitting display apparatus of claim 3, wherein
at least one surface of the base material is antistatic
treated.
6. The organic light-emitting display apparatus of claim 3, wherein
the adhesive layer has a thickness of 10 to 30 .mu.m, and the base
material has a thickness of 65 to 140 .mu.m.
7. The organic light-emitting display apparatus of claim 3, wherein
adhesion of the adhesive layer measured by utilizing a measurement
method below is 250 gf/in or higher: wherein in the measurement
method, the adhesive layer was adhered to glass, and after 24
hours, adhesion of the adhesive layer was measured when the
adhesive layer was exfoliated at 180.degree. at a rate of 5 mm per
second.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application is a divisional of U.S. patent application
Ser. No. 16/478,838, filed Jul. 17, 2019, which is a National Phase
Patent Application of International Patent Application Number
PCT/KR2018/000822, filed on Jan. 18, 2018, which claims priority of
Korean Patent Application No. 10-2017-0008519, filed Jan. 18, 2017.
The entire contents of all of which are incorporated herein by
reference.
TECHNICAL FIELD
[0002] The present disclosure relates to a protection film for a
lower part of an OLED panel, and more particularly, to a protection
film for a lower part for an OLED panel, the protection film having
a significantly improved recognition rate of an alignment process,
being capable of preventing generation of static electricity
through an antistatic treatment, and having excellent adhesion to
an OLED panel at the same time, and an organic light-emitting
display apparatus including the protection film for a lower part of
an OLED panel.
BACKGROUND ART
[0003] Recently, flat panel displays have been gaining attention as
display apparatuses according to the remarkable progress in
information communication technology and expansion of the market.
Examples of the flat panel displays include liquid crystal
displays, plasma display panels, and organic light emitting
devices.
[0004] Organic light emitting devices have advantages such as a
high response speed, a light weight, a small thickness, a compact
size, low power consumption, self-emitting characteristics, and
flexible characteristics, and thus, are increasingly in demand for
next-generation display devices and flexible displays, and even in
illumination.
[0005] An organic light emitting device is manufactured by
sequentially depositing, on a glass substrate, a transparent
electrode, a hole injection layer, a hole transport layer, an
organic emitting layer, an electron transport layer, an electron
injection layer, and a metal electrode in an order, and emits light
based on the principle that light is emitted by using energy
discharged when electrons and holes supplied from both electrodes
recombine in the organic emitting layer.
[0006] An organic light-emitting device is likely to deteriorate
due to external factors such as external humidity or oxygen or
ultraviolet rays, and thus a packaging technique of encapsulating
the organic light-emitting device is essential, and for
applications over a broad range, an organic light-emitting device
is required to be thin.
[0007] Meanwhile, a lower part protection film is included under an
OLED panel to protect the OLED panel and prevent generation of
static electricity. A lower part protection film for an OLED panel
according to the related art has a low reflectance, and thus,
errors are frequently caused in an alignment process, making the
manufacture of an OLED panel difficult. Also, generation of static
electricity is not prevented, and adhesion to the OLED panel is
poor.
[0008] Thus, there is the pressing need for research into a lower
part protection film for an OLED panel, the lower part protection
film having a high reflectance to significantly improve a
recognition rate of an alignment process, being capable of
preventing generation of static electricity through an antistatic
treatment, and having excellent adhesion to an OLED panel at the
same time.
DESCRIPTION OF EMBODIMENTS
Technical Problem
[0009] The present disclosure provides a lower part protection film
for an OLED panel, the lower part protection film having a high
reflectance to significantly improve a recognition rate of an
alignment process, being capable of preventing generation of static
electricity through an antistatic treatment, and having excellent
adhesion to an OLED panel at the same time.
Solution to Problem
[0010] According to an aspect of the present disclosure, there is
provided a lower part protection film for an OLED panel, the lower
part protection film including: a base-carrier film including a
base film including a first adhesive layer formed on an upper
surface of a first base material and a carrier film including a
second adhesive layer adhered to a lower surface of the first base
material and a second base material adhered to a lower surface of
the second adhesive layer; and a liner film adhered using the first
adhesive layer, wherein the lower part protection film for an OLED
panel satisfies both Condition (1) and Condition (2) below:
[0011] (1) a reflectance of the lower part protection film for an
OLED panel is 12 to 18% at a wavelength of 400 to 700 nm; and
[0012] (2) a reflectance ratio between the liner film and the
base-carrier film at a wavelength of 400 nm to 700 nm is 1:0.3 to
3.0.
Advantageous Effects of Disclosure
[0013] A lower part protection film for an OLED panel, according to
the present disclosure, may have a high reflectance, and thus a
recognition rate of an alignment process may be significantly
improved, and generation of static electricity may be prevented
through an antistatic treatment, and adhesion to an OLED panel may
be excellent at the same time.
BRIEF DESCRIPTION OF DRAWINGS
[0014] FIG. 1 is a cross-sectional view of a lower part protection
film for an OLED panel, according to an embodiment of the present
disclosure.
[0015] FIG. 2 is a disassembled cross-sectional view of a lower
part protection film for an OLED panel, according to an embodiment
of the present disclosure.
[0016] FIG. 3 is a cross-sectional view of an organic
light-emitting display apparatus according to an embodiment of the
present disclosure.
BEST MODE
[0017] According to an embodiment of the present disclosure, a
lower part protection film for an OLED panel is provided, the lower
part protection film for an OLED panel, including: a base-carrier
film including a base film including a first adhesive layer formed
on an upper surface of a first base material and a carrier film
including a second adhesive layer adhered to a lower surface of the
first base material and a second base material adhered to a lower
surface of the second adhesive layer; and a liner film adhered
using the first adhesive layer, wherein the lower part protection
film for an OLED panel satisfies both Conditions (1) and (2)
below:
[0018] (1) a reflectance of the lower part protection film for an
OLED panel is 12 to 18% at a wavelength of 400 to 700 nm; and
[0019] (2) a reflectance ratio between the liner film and the
base-carrier film at a wavelength of 400 to 700 nm is 1:0.3 to
3.0.
[0020] According to an embodiment of the present disclosure, the
lower part protection film for an OLED panel may satisfy both
Conditions (1) and (2) below:
[0021] (1) a reflectance of the lower part protection film for an
OLED panel is 12 to 16% at a wavelength of 400 to 700 nm; and
[0022] (2) a reflectance ratio between the liner film and the
base-carrier film at a wavelength of 400 to 700 nm is 1:0.62 to
2.6.
[0023] Also, the lower part protection film for an OLED panel may
satisfy Condition (3) below at a wavelength of 400 to 700 nm:
b + c a .ltoreq. 1.0 , ( 3 ) ##EQU00001##
[0024] where a denotes a reflectance deviation (%) of the liner
film, b denotes a reflectance deviation (%) of the base-carrier
film, and c denotes a reflectance deviation (%) of the lower part
protection film for an OLED panel.
[0025] Also, a reflectance of the lower part protection film for an
OLED panel may be gradually reduced as a wavelength increases.
[0026] Also, the first base material and the second base material
may be a PET base material, and the first adhesive layer and the
second adhesive layer may be acrylic adhesive layers.
[0027] Also, a lower surface of the liner film may be silicon
release-treated.
[0028] Also, the liner film may satisfy both Conditions (4) and (5)
below:
[0029] (4) reflectance at a wavelength of 520 nm>reflectance at
a wavelength of 440 nm; and
[0030] (5) reflectance at a wavelength of 520 nm>reflectance at
a wavelength of 690 nm.
[0031] Also, the liner film may have a reflectance of 5 to 13% at a
wavelength of 400 to 700 nm.
[0032] Also, the base-carrier film may have a reflectance of 8 to
13% at a wavelength of 400 to 700 nm.
[0033] Also, the first adhesive layer and the second adhesive layer
may include an antistatic agent, and at least one surface of each
of the liner film, the first base material, and the second base
material may be antistatic treated.
[0034] Also, the base film may have a transmittivity of 85 to 98%
and a haze of 0.2 to 1.0%.
[0035] Also, the lower part protection film for an OLED panel may
have a total haze of 5 to 10%.
[0036] Also, the first adhesive layer may have a thickness of 10 to
30 .mu.m, and the first base material may have a thickness of 65 to
140 .mu.m.
[0037] Also, the liner film may have a thickness of 55 to 95 .mu.m,
and the second adhesive layer may have a thickness of 1 to 10
.mu.m, and the second base material may have a thickness of 20 to
60 .mu.m.
[0038] Also, the liner film may have a releasing force of 5 gf/in
or less.
[0039] Also, adhesion of the first adhesive layer measured by using
a measurement method below may be 250 gf/in or higher:
[0040] [Measurement Method]
[0041] The first adhesive layer was adhered to glass, and after 24
hours, an adhesion of the first adhesive layer was measured when
the first adhesive layer was exfoliated at 180.degree. at a rate of
5 mm per second.
[0042] Also, an exfoliation force between the base film and the
carrier film may be 3 to 10 gf/in.
[0043] According to another embodiment of the present disclosure,
there is provided a method of applying a lower part protection film
for an OLED panel, the method including: exfoliating a liner film
from the lower part protection film for an OLED panel; attaching,
to the OLED panel, a base-carrier film, from which the liner film
is exfoliated; and exfoliating the carrier film from the
base-carrier film attached to the OLED panel.
[0044] According to another embodiment of the present disclosure,
there is provided an organic light-emitting display apparatus
including a base film and an OLED panel, wherein the OLED panel
includes a substrate and an organic light-emitting device on the
substrate, wherein the base film includes a base film and an
adhesive layer arranged on an upper surface of the base material,
and the base film has a transmittivity of 85 to 98% and a haze of
0.2 to 1.0%.
[0045] Also, the adhesive layer may include an antistatic
agent.
[0046] Also, at least one surface of the base material may be
antistatic treated.
[0047] Also, the adhesive layer may have a thickness of 10 to 30
.mu.m, and the base material has a thickness of 65 to 140
.mu.m.
[0048] Also, adhesion of the adhesive layer measured by using a
measurement method below may be 250 gf/in or higher:
[0049] [Measurement Method]
[0050] The adhesive layer was adhered to glass, and after 24 hours,
an adhesion of the adhesive layer was measured when the adhesive
layer was exfoliated at 180.degree. at a rate of 5 mm per
second.
[0051] Also, the adhesive layer may be formed of a first adhesive
composition, and the adhesive composition may include a first main
agent resin and a pyridine antistatic agent, wherein the pyridine
antistatic agent is included in an amount of 0.5 to 5 parts by
weight based on 100 parts by weight of the first main agent
resin.
MODE OF DISCLOSURE
[0052] Hereinafter, embodiments of the present disclosure will be
described in detail with reference to the accompanying drawings,
which will be readily apparent to those skilled in the art to which
the present disclosure pertains. The present disclosure may be
embodied in many different forms and should not be construed as
limited to the embodiments set forth herein. In the drawings,
portions unrelated to the description are omitted for clarity of
the present disclosure, and like reference numerals refer to like
elements throughout.
[0053] As illustrated in FIG. 1, a lower part protection film for
an OLED panel, according to an embodiment of the present disclosure
includes a base-carrier film 200 including a base film 120
including a first adhesive layer 121 formed on an upper surface of
a first base material 122 and a carrier film 130 including a second
adhesive layer 131 adhered to a lower surface of the first base
material 122 and a second base material 132 adhered to a lower
surface of the second adhesive layer 131, and a liner film 110
adhered using (adhered to and using) the first adhesive layer
121.
[0054] Before describing each layer constituting the lower part
protection film for an OLED panel, according to the present
disclosure, as illustrated in FIG. 1, the reason why the lower part
protection film for an OLED panel according to the present
disclosure, and the liner film 110 and the base-carrier film 200
included therein have to satisfy Condition (1) and Condition (2)
below will be described first.
[0055] When attaching a protection film to the bottom of an OLED
panel, and when a reflectance thereof is low and a recognition rate
of an alignment process is low, it is impossible to accurately
attach a protection film to the OLED panel, and thus errors may be
caused. If the protection film is repeatedly exfoliated and
attached whenever an error occurs, residue may be left in the OLED
panel or the manufacturing costs and time may increase. Also, when
exfoliating the protection film from the OLED panel when an error
has occurred, if a recognition rate of an alignment process is low,
exfoliating the protection film may also be difficult. Thus, there
is a need to increase the recognition rate of an alignment
process.
[0056] Accordingly, when attaching a protection film to the bottom
of an OLED panel, it is essential that the lower part protection
film for an OLED panel has an appropriate reflectance. The lower
part protection film for an OLED panel according to the present
disclosure satisfies both Condition (1) and Condition (2) below to
show an appropriate reflectance and thus to improve a recognition
rate of an alignment process.
[0057] Condition (1) may be that a reflectance of the lower part
protection film for an OLED panel is 12 to 18%, preferably, 12 to
16%, at a wavelength of 400 to 700 nm, and Condition (2) may be
that a reflectance ratio between a liner film and a base-carrier
film is 1:0.3 to 3.0, preferably, 0.62 to 2.6.
[0058] When the reflectance of the lower part protection film for
an OLED panel does not satisfy 12 to 18% at a wavelength of 400 to
700 nm in Condition (1), it may be difficult to exfoliate a liner
film in an operation of attaching the lower part protection film
for an OLED panel, to the bottom of an OLED panel, and this may
increase a defect rate. Also, when the reflectance ratio between
the liner film and the base-carrier film at a wavelength of 400 to
700 nm does not satisfy 1:0.3 to 3.0 in Condition (2), it may be
impossible to accurately attach a protection film to an OLED panel
in an operation of attaching a lower part protection film for an
OLED panel, to the bottom of an OLED panel, and this may cause an
error.
[0059] The lower part protection film for an OLED panel may satisfy
Condition (3) below at a wavelength of 400 to 700 nm.
b + c a .ltoreq. 1.0 , ( 3 ) ##EQU00002##
[0060] where a denotes a reflectance deviation (%) of the liner
film, b denotes a reflectance deviation (%) of the base-carrier
film, and c denotes a reflectance deviation (%) of the lower part
protection film for an OLED panel.
[0061] A deviation in a reflectance according to wavelength refers
to a variation in a reflectance according to a varying wavelength,
and a small deviation means that an increase or decrease in the
reflectance according to a variation in a wavelength is small,
meaning that a constant recognition rate of an alignment process
may be obtained. A large deviation means that an increase or
decrease in the reflectance according to a variation in a
wavelength may be large, and a reflectance may be excessively low
at a certain wavelength, and a recognition rate of an alignment
process may be poor accordingly.
[0062] In Condition (3), when
b + c a ##EQU00003##
exceeds 1, a deviation in a reflectance of the base-carrier film
and/or the lower part protection film for an OLED panel may be
excessive according to a wavelength, thus frequently causing
errors.
[0063] Also, as a wavelength increases, a reflectance of the lower
part protection film for an OLED panel may be gradually reduced. In
detail, from a short wavelength to a long wavelength, a reflectance
of the lower part protection film for an OLED panel may be
gradually reduced, but is not limited thereto.
[0064] Meanwhile, a total haze of the lower part protection film
for an OLED panel may be 5 to 10%, preferably, 5.5 to 9.5%. When a
haze of the lower part protection film for an OLED panel deviates
from the above ranges, it may be difficult to exfoliate a liner
film in an operation of attaching the lower part protection film
for an OLED panel, to the bottom of an OLED panel, and a defect
rate may increase accordingly.
[0065] Hereinafter, components included in the lower part
protection film for an OLED panel will be described in detail.
[0066] First, the liner film 110 will be described.
[0067] The liner film 110 has a function of protecting the
base-carrier film 200. In a process of attaching a lower part
protection film for an OLED panel according to the present
disclosure, to an OLED panel, an alignment process may be
performed, and in this case, the liner film 110 is first
exfoliated, and then the base-carrier film 200 may be attached to
the OLED panel.
[0068] Here, in an operation of exfoliating the liner film 110, in
order to prevent exfoliation between the base film 120 and the
carrier film 130, a releasing force of the liner film 110 may be
relatively small compared to an exfoliation force between the base
film 120 and the carrier film 130, and a releasing force of the
liner film 110 may preferably be 5 gf/in or less, more preferably,
2 to 4 gf/in. When the releasing force of the liner film 110
exceeds 5 gf/in, and when exfoliating the liner film 110 from the
base-carrier film 200, exfoliation between the base film 120 and
the carrier film 130 may be generated, and this may significantly
increase a defect rate.
[0069] As illustrated in FIG. 2, in order for the liner film 110 to
exhibit a releasing force as described above, a lower surface of
the liner film 110 may be release-treated (A). In the release
treatment above, any material that is typically used in release
treatment may be used without limitation, and preferably, release
treatment may preferably be performed using silicon to obtain an
appropriate level of releasing force.
[0070] Meanwhile, as the lower surface of the liner film 110 is
release-treated (A), the liner film 110 may satisfy both Conditions
(4) and (5) below.
[0071] (4) reflectance at a wavelength of 520 nm>reflectance at
a wavelength of 440 nm; and
[0072] (5) reflectance at a wavelength of 520 nm>reflectance at
a wavelength of 690 nm.
[0073] As Conditions (4) and (5) are both satisfied, an appropriate
reflectance for an alignment process may be obtained, thus
increasing a recognition rate of the alignment process. When
Conditions (4) and (5) are not met, in an operation of identifying
removal after exfoliating the liner film, an error may occur, that
an operation of attaching a protection film, from which a liner is
not removed, to a panel, may be performed, increasing a defect
rate.
[0074] In addition, the liner film 110 may have a reflectance of 5
to 13%, preferably, 6 to 12%, at a wavelength of 400 to 700 nm, to
satisfy both Condition (1) and Condition (2). When the reflectance
of the liner film 110 at a wavelength of 400 to 700 nm does not
satisfy the above ranges, a recognition rate of an alignment
process may be degraded, and occurrence of errors and a defect rate
may be increased as a result.
[0075] Meanwhile, to prevent generation of static electricity, at
least one surface of the liner film 110 according to the present
disclosure, preferably an upper surface and a lower surface
thereof, may be antistatic treated. Through antistatic treatment,
generation of static electricity may be prevented, and a difference
in refractive indices with respect to the base-carrier film may be
reduced, thus further improving a recognition rate of an alignment
process.
[0076] Any material that is typically used in a liner film in the
art may be used as the liner film 110 without limitation, and
preferably, a PET base material may be used. Also, a thickness of
the liner film 110 is not limited as long as the thickness is a
thickness of a liner film that may be typically used in a
protection film, and may preferably be 55 to 95 .mu.m, more
preferably 60 to 90 .mu.m, but is not limited thereto.
[0077] Next, the base-carrier film 200 will be described.
[0078] The base-carrier film 200 includes a base film 120 including
a first adhesive layer 121 formed on an upper surface of a first
base material 122 and a carrier film 130 including a second
adhesive layer 131 adhered to a lower surface of the first base
material 122 and a second base material 132 adhered to a lower
surface of the second adhesive layer 131.
[0079] First, the carrier film 130 has a function of protecting the
bottom of the base film 120 that is directly attached to an OLED
panel. In a process of attaching a lower part protection film for
an OLED panel according to the present disclosure, to an OLED
panel, an alignment process may be performed, and in this case, the
liner film 110 is first exfoliated, and then the base-carrier film
200 may be attached to the OLED panel, and then the carrier film
130 may be exfoliated from the base-carrier film 200.
[0080] In an operation of exfoliating the carrier film 130 from the
base-carrier film 200, in order to prevent exfoliation between the
OLED panel and the base film 120, an exfoliation force between the
base film 120 and the carrier film 130 may be relatively
sufficiently small compared to an adhesion of the first adhesive
layer 121 of the base film 120, and preferably, an exfoliation
force between the base film 120 and the carrier film 130 may be 3
to 10 gf/in, more preferably, 4 to 9 gf/in. When the exfoliation
force between the base film 120 and the carrier film 130 does not
satisfy the above ranges, in an operation of exfoliating the liner
film 110, exfoliation between the base film 120 and the carrier
film 130 may occur, and exfoliation between the OLED panel and the
base film 120 may occur in an operation of exfoliating the carrier
film 130 from the base film 120.
[0081] Meanwhile, to prevent generation of static electricity, at
least one surface of the second base material 132 included in the
carrier film 130 according to the present disclosure, preferably a
lower surface thereof, may be antistatic treated. Through
antistatic treatment, generation of static electricity may be
prevented, and a reflectance may be improved by reducing a
difference in refractive indices with respect to the second
adhesive layer 131 and the base film 120.
[0082] As the second base material 132, any material that may be
typically used in a protection film in the art may be used without
limitation, and preferably, a PET base material may be used. Also,
a thickness of the second base material 132 is not limited as long
as the thickness is a thickness of a base material that may be
typically used in a protection film, and may be preferably 20 to 60
.mu.m, more preferably, 25 to 55 .mu.m.
[0083] As the second adhesive layer 131 included in the carrier
film 130, any material for typically forming an adhesive layer in
the art may be used without limitation, and the second adhesive
layer 131 may preferably be an acrylic adhesive layer. In addition,
a thickness of the second adhesive layer 131 is not limited as long
as the thickness is a thickness of an adhesive layer typically
included in a protection film, and may preferably be 1 to 10 .mu.m,
more preferably, 2 to 9 .mu.m.
[0084] The second adhesive layer 131 included in the carrier film
130 according to the present disclosure may include an antistatic
agent to prevent generation of static electricity. By including the
antistatic agent, generation of static electricity may be
prevented, and a reflectance may be improved by reducing a
difference in refractive indices with respect to the second base
material 132 and the base film 120.
[0085] Detailed description of the second adhesive layer 131 will
be provided with reference to a manufacturing method which will be
described later.
[0086] Next, the base film 120 is directly attached to an OLED
panel and has a function of protecting the bottom of the OLED
panel. In a process of attaching a lower part protection film for
an OLED panel according to the present disclosure, to an OLED
panel, an alignment process may be performed, and in this case, the
liner film 110 is first exfoliated, and then the base-carrier film
200 may be attached to the OLED panel, and then the carrier film
130 may be exfoliated from the base-carrier film 200 to locate a
protection film on the bottom of the OLED panel.
[0087] Here, to prevent exfoliation of the protection film formed
on the bottom of the OLED panel, an adhesion of the base film 120
has to be sufficiently large, and preferably, an adhesion of a
first adhesive layer measured using a measurement method below may
be 250 gf/in or higher, more preferably, the adhesion may be 1000
to 2300 gf/in.
[0088] [Measurement Method]
[0089] The first adhesive layer was adhered to glass, and after 24
hours, adhesion of the first adhesive layer was measured when the
first adhesive layer was exfoliated at 180.degree. at a rate of 5
mm per second.
[0090] When the adhesion of the base film 120 measured using the
measurement method is less than 250 gf/in, the base film 120 may be
exfoliated from the OLED panel.
[0091] Meanwhile, to prevent generation of static electricity, at
least one surface of the first base material 122 included in the
base film 120 according to the present disclosure, preferably a
lower surface thereof, may be antistatic treated. Through
antistatic treatment, generation of static electricity may be
prevented, and a reflectance may be improved by reducing a
difference in refractive indices with respect to the first adhesive
layer 121 and the carrier film 130.
[0092] Any material that is typically used in a protection film in
the art may be used as the first base materials 122 without
limitation, and preferably, a PET base material may be used. In
addition, a thickness of the first base material 122 is not limited
as long as the thickness may be typically used in a protection
film, and may preferably be 65 to 140 .mu.m, more preferably, 70 to
130 .mu.m.
[0093] As the first adhesive layer 121 included in the base film
120, any material for typically forming an adhesive layer in the
art may be used without limitation, and the first adhesive layer
121 may preferably be an acrylic adhesive layer. In addition, a
thickness of the first adhesive layer 121 is not limited as long as
the thickness is a thickness of an adhesive layer typically
included in a protection film, and may preferably be 10 to 30
.mu.m, more preferably, 12 to 26 .mu.m.
[0094] The first adhesive layer 121 included in the base film 120
according to the present disclosure may include an antistatic agent
to prevent generation of static electricity. By including the
antistatic agent, generation of static electricity may be
prevented, and a reflectance may be improved by reducing a
difference in refractive indices with respect to the first base
material 122 and the carrier film 130.
[0095] Detailed description of the first adhesive layer 121 will be
provided with reference to a manufacturing method which will be
described later.
[0096] The base film 120 may have a transmittivity of 85 to 98%,
preferably, a transmittivity of 88 to 97%, and a haze of 0.2 to
1.0%, preferably, a haze of 0.3 to 0.9%. When the base film 120
does not satisfy the above transmittivity range and the above haze
range, it may be difficult to realize a targeted reflectance, and
also, an inspection capability regarding a defect on the appearance
of a product during a product inspection process may be degraded,
thereby allowing defects to pass undetected.
[0097] Also, in order to satisfy both Condition (1) and Condition
(2), the base-carrier film 200 may have a reflectance of 8 to 13%,
preferably, 9 to 12% at a wavelength of 400 to 700 nm. At a
wavelength of 400 to 700 nm, when a reflectance of the base-carrier
film 200 is less than 8%, a recognition rate of an alignment
process are degraded, and thus, errors and a defect rate are
increased accordingly. In detail, as the recognition rate of the
alignment process are degraded, when the base-carrier film 200 to
be attached to the bottom of the OLED panel is incorrectly
attached, then the OLED panel and the base-carrier film 200 have to
be exfoliated again and attachment is to be re-performed, and as
the process is repeated, there may be residue under the OLED panel,
and this may increase a defect rate. Also, when the reflectance
exceeds 13%, the recognition rate of the alignment process may be
degraded, and thus, errors and a defect rate may be increased.
[0098] Meanwhile, the reflectance at a wavelength of 400 to 700 nm
specified in the present disclosure refers to not only a
reflectance at a certain wavelength, but an appropriate reflectance
at most wavelengths in a visible ray range, and thus, it means that
a recognition rate of an alignment process may be high at most
wavelengths in the visible ray range regardless of any particular
wavelength.
[0099] The lower part protection film for an OLED panel described
above may be manufactured by using a manufacturing method which
will be described later, but is not limited thereto.
[0100] The lower part protection film for an OLED panel according
to the present disclosure may be manufactured using a method
including: manufacturing a base film 120 by forming a first
adhesive layer 121 by coating and curing a first adhesive
composition including a first main agent resin, on an upper surface
of a first base material 122; manufacturing a carrier film 130 by
forming a second adhesive layer 131 by coating and curing a second
adhesive composition including a second main agent resin, on an
upper surface of a second base material 132; manufacturing a
base-carrier film 200 by laminating the base film 120 on an upper
surface of the carrier film 130; and laminating the liner film 110
on the base-carrier film 200 to manufacture a lower part protection
film for an OLED panel.
[0101] First, an operation of manufacturing the base film 120 by
forming the first adhesive layer 121 by coating and curing a first
adhesive composition including a first main agent resin, on an
upper surface of the first base material 122 will be described.
[0102] The first adhesive composition may include a first main
agent resin, and may further include a first curing agent, a
solvent, and an antistatic agent.
[0103] The first main agent resin may be any resin that may be
typically used for forming an adhesive layer having a sufficient
adhesion, without limitation, and may preferably be an acrylic
resin, and more preferably, polybutyl methacrylate, more
preferably, polybutyl methacrylate having a weight average
molecular weight of 200,000 to 1,000,000, and most preferably,
polybutyl methacrylate having a weight average molecular weight of
400,000 to 800,000.
[0104] Also, the first curing agent may be any curing agent that
may be used in forming an adhesive layer exhibiting typically
sufficient adhesion, without limitation, and preferably, an epoxy
curing agent may be used, and more preferably, an epoxy amine
curing agent, and even more preferably,
N,N,N,N'-tetraglycidyl-m-xylylenediamine may be used. The first
curing agent may be included in an amount of 0.02 to 0.08 parts by
weight, preferably, 0.03 to 0.07 parts by weight, based on 100
parts by weight of the first main agent resin. When the content of
the first curing agent is less than 0.02 parts by weight based on
100 parts by weight of the first main agent resin, the first
adhesive layer may not be cured to a target level, and when the
content of the first curing agent exceeds 0.08 parts by weight, the
first adhesive layer may be excessively cured to lower the
adhesion.
[0105] Also, the solvent is not particularly limited as long as it
is a solvent that can be used in an adhesive composition for
typically forming an adhesive layer, and may preferably include one
or more selected from the group consisting of an aqueous solvent,
an alcohol solvent, a ketone solvent, an amine solvent, an ester
solvent, an acetate solvent, an amide solvent, a halogenated
hydrocarbon solvent, an ether solvent, and a furan solvent, and
more preferably, one or more selected from the group consisting of
an alcohol solvent, a ketone solvent, an amine solvent, an ester
solvent, an acetate solvent, and an ether solvent, and may be most
preferably methyl ethyl ketone. The solvent may be included, but is
not limited to, in an amount of 35 to 55 parts by weight,
preferably 40 to 50 parts by weight, based on 100 parts by weight
of the first main agent resin.
[0106] The antistatic agent may be any material as long as it
prevents static electricity, and preferably, using a pyridine
antistatic agent may be useful in preventing static electricity and
reducing a difference in refractive indices between layers to
improve reflectance. The antistatic agent may be included at an
amount of 0.5 to 5 parts by weight, preferably, 1 to 4 parts by
weight, based on 100 parts by weight of the first main agent resin.
When the antistatic agent does not satisfy the above ranges,
targeted antistatic effects may not be obtained, and a difference
in refractive indices between layers may be increased, and thus, a
reflectance may be decreased and a recognition rate of an alignment
process may be poor.
[0107] The base film 120 may be manufactured by forming the first
adhesive layer 121 by coating and curing the first adhesive
composition described above on the upper surface of the first base
material 122 having a lower surface that is antistatic treated.
[0108] Next, an operation of manufacturing the carrier film 130 by
forming the second adhesive layer 131 by coating and curing a
second adhesive composition including a second main agent resin, on
an upper surface of the second base material 132 will be
described.
[0109] The second adhesive composition may include a second main
agent resin, and may further include a second curing agent, a
solvent, and an antistatic agent.
[0110] The second main agent resin may be any resin that may be
typically used for forming an adhesive layer having a relatively
small adhesion compared with the first adhesive layer, without
limitation, and may preferably be an acrylic resin, and more
preferably, polymethyl methacrylate, even more preferably,
polymethyl methacrylate having a weight average molecular weight of
5,000 to 170,000, and most preferably, polymethyl methacrylate
having a weight average molecular weight of 50,000 to 150,000.
[0111] Also, the second curing agent may be any curing agent that
may be used for forming an adhesive layer that exhibits a
relatively low adhesion compared with the first adhesive layer,
without limitation, and preferably, an isocyanate curing agent may
be used. The second curing agent may be included in an amount of 2
to 8 parts by weight, preferably, 3 to 7 parts by weight, based on
100 parts by weight of the second main agent resin. When the
content of the second curing agent is less than 2 parts by weight
based on 100 parts by weight of the second main agent resin, the
second adhesive layer may not be cured to a target level, and when
the content of the second curing agent exceeds 8 parts by weight,
the second adhesive layer may be excessively cured to lower the
adhesion.
[0112] Also, the solvent is not particularly limited as long as it
is a solvent that can be used in an adhesive composition for
typically forming an adhesive layer, and may preferably include one
or more selected from the group consisting of an aqueous solvent,
an alcohol solvent, a ketone solvent, an amine solvent, an ester
solvent, an acetate solvent, an amide solvent, a halogenated
hydrocarbon solvent, an ether solvent, and a furan solvent, and
more preferably, one or more selected from the group consisting of
an alcohol solvent, a ketone solvent, an amine solvent, an ester
solvent, an acetate solvent, and an ether solvent, and may be most
preferably methyl ethyl ketone. The solvent may be included, but is
not limited to, in an amount of 60 to 80 parts by weight,
preferably 65 to 75 parts by weight, based on 100 parts by weight
of the second main agent resin.
[0113] Also, the antistatic agent may be any material as long as it
prevents static electricity, and preferably, using a pyridine
antistatic agent may be useful in preventing static electricity and
reducing a difference in refractive indices between layers to
improve reflectance. The antistatic agent may be included at an
amount of 0.1 to 0.4 parts by weight, preferably, 0.15 to 0.35
parts by weight, based on 100 parts by weight of the second main
agent resin. When the antistatic agent does not satisfy the above
ranges, targeted antistatic effects may not be obtained and a
difference in refractive indices between layers may be increased,
and thus, a reflectance may be decreased and a recognition rate of
an alignment process may be poor.
[0114] Meanwhile, the second adhesive composition may further
include a leveling agent and a wetting agent. The leveling agent
and the wetting agent may be any material, without limitation, as
long as they are typically used in forming an adhesive layer in the
art. Preferably, the leveling agent may be polyacrylate, and the
wetting agent may be polyether siloxane, but they are not limited
thereto. In addition, the leveling agent may be included in an
amount of 0.25 to 2.25 parts by weight, preferably, 0.5 to 2 parts
by weight, based on 100 parts by weight of the second main agent
resin, and the wetting agent may be included in an amount of 0.2 to
0.8 parts by weight, preferably, 0.3 to 0.7 parts by weight, based
on 100 parts by weight of the second main agent resin, but they are
not limited thereto.
[0115] The carrier film 130 may be manufactured by forming the
second adhesive layer 131 by coating and curing the second adhesive
composition described above on the upper surface of the second base
material 132 having a lower surface that is antistatic treated.
[0116] Next, an operation of laminating the base film 120 on an
upper surface of the carrier film 130 to manufacture the
base-carrier film 200 and an operation of laminating the liner film
110 on the base-carrier film 200 to manufacture a lower part
protection film for an OLED panel will be described.
[0117] The base film 120 and the liner film 110 may be laminated
using any method and/or under any conditions that are typically
used in the art. Lamination may be performed preferably by using a
roll laminator at room temperature, but is not limited thereto.
[0118] Also, the base-carrier film 200 may be laminated using any
method and/or under any conditions for typically laminating the
base film 120 and the carrier film 130 in the art, and preferably,
lamination may be performed at room temperature by using a roll
laminator to manufacture a lower part protection film for an OLED
panel, but is not limited thereto.
[0119] According to the present disclosure, a method of applying a
lower part protection film for an OLED panel according to the
present disclosure, to an OLED panel, is provided; in detail, a
method of applying a lower part protection film for an OLED panel
is provided, the method including: exfoliating a liner film from
the lower part protection film for an OLED panel described above;
attaching a base-carrier film, from which the liner film is
exfoliated, to an OLED panel; and exfoliating the carrier film from
the base-carrier film attached to the OLED panel.
[0120] First, a first alignment process may be performed to
exfoliate the liner film from the lower part protection film for an
OLED panel, and the liner film may be exfoliated from the lower
part protection film for an OLED panel by irradiating light of a
wavelength of 400 to 700 nm and sensing reflected light. Here, when
the liner film does not show an appropriate level of reflectance,
an error may occur, and the process time and/or costs may increase,
and a defect rate may be increased.
[0121] Next, a second alignment process may be performed to attach,
to the OLED panel, the base-carrier film, from which the liner film
is exfoliated, and the base-carrier film may be attached to the
OLED panel by irradiating light of a wavelength of 400 to 700 nm
and sensing the reflected light. Here, when the base-carrier film
does not show an appropriate level of reflectance, it may be
difficult to accurately attach a base-carrier film to the OLED
panel, and thus an error may be caused. If a protection film is
repeatedly exfoliated and attached whenever an error occurs,
residue may be left in the OLED panel or the manufacturing costs
and time may increase.
[0122] Next, a third alignment process may be performed to
exfoliate the carrier film from the base-carrier film attached to
the OLED panel, and the carrier film may be exfoliated from the
base-carrier film attached to the OLED panel by irradiating light
of a wavelength of 400 to 700 nm and sensing reflected light. Here,
when the base-carrier film does not show an appropriate level of
reflectance, an error may occur, and thus, the processing time
and/or costs may increase, and a defect rate may be increased.
[0123] Meanwhile, the present disclosure includes an organic
light-emitting display apparatus 10 implemented by including the
above-described base film.
[0124] As shown in FIG. 3, the organic light-emitting display
apparatus 10 may include the base film 120'' attached to the bottom
of an OLED panel 300. Here, the OLED panel 300 includes a substrate
and an organic light-emitting device arranged on the substrate. The
organic light-emitting device may be provided by stacking a first
electrode, an intermediate layer including an organic emitting
layer, and a second electrode. The base film 120'' may be attached
to the bottom of the substrate of the OLED panel 300. In detail, as
the base film 120'' including a first adhesive layer 121'' having a
sufficient adhesion and a first base material 122'' having a
function of protecting the OLED panel 300 is included, the bottom
of the OLED panel 300 may be protected, and generation of static
electricity of the OLED panel 300 may be prevented.
[0125] Meanwhile, as the lower part protection film for an OLED
panel according to the present disclosure has a high reflectance, a
recognition rate of an alignment process may be significantly
improved, and also, generation of static electricity may be
prevented through an antistatic treatment, and an excellent
adhesion to an OLED panel may be provided at the same time.
[0126] The present disclosure will be described in more detail with
reference to embodiments thereof below but the scope of the present
disclosure is not limited by the embodiments, which should be
interpreted as being provided to help to understand the present
disclosure.
Example 1
[0127] (1) Manufacture of Base Film and Liner Film Lamination
[0128] A first adhesive composition was prepared by mixing
polybutyl methacrylate (BURIM CHEMICAL, BA8900) having a weight
average molecular weight of 600,000 as a first main agent resin,
0.05 parts by weight of N,N,N,N'-tetraglycidyl-m-xylenediamine
(BURIM CHEMICAL, 45S) as a first curing agent, 2.5 parts by weight
of a pyridine antistatic agent (KOEI, IL-P14-2) as an antistatic
agent, and 45 parts by weight of methyl ethyl ketone (MEK) as a
solvent, based on 100 parts by weight of the first main agent
resin.
[0129] A base film was manufactured by coating the first adhesive
composition on an upper surface of the first base material that is
antistatic-treated by coating a thin film of PEDOT/PSS (poly
(3,4-ethylenedioxythiophene) polystyrene sulfonate) on a lower
surface of a PET base material having a thickness of 75 .mu.m, and
an upper surface and the lower surface of the PET base material
having a thickness of 75 .mu.m were coated with a thin film of
PEDOT/PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate)
to antistatic-treat the PET base material, and a thin film of a
silicon releasing agent was coated on a lower surface of a liner
film to silicon release-treat the liner film, and then the liner
film was laminated using a roll laminator at room temperature and
cured at 50.degree. C. for 48 hours to manufacture the base film
including the first adhesive layer having a thickness of 13 .mu.m
and the liner film stacked on the base film.
[0130] (2) Manufacture of Carrier Film
[0131] A second adhesive composition was prepared by mixing
polymethyl methacrylate (SUSAN POLYMER Co., Ltd., SA609) having a
weight average molecular weight of 100,000 as a second main agent
resin, 5 parts by weight of polyisocyanate (SUSAN POLYMER Co.,
Ltd., SAX802) as a second curing agent, 0.25 parts by weight of a
pyridine antistatic agent (KOEI, IL-P14-2) as an antistatic agent,
1.25 parts by weight of polyacrylate (BYK, BYK361N) as a leveling
agent, polyether siloxane (TEGO, WET270) as a wetting agent, and 70
parts by weight of methyl ethyl ketone (MEK) as a solvent, based on
100 parts by weight of the second main agent resin.
[0132] The second adhesive composition was coated on the upper
surface of the second base material that is antistatic-treated by
coating a thin film of PEDOT/PSS (poly (3,4-ethylenedioxythiophene)
polystyrene sulfonate) on a lower surface of a PET base material
having a thickness of 38 .mu.m, and cured at 50.degree. C. for 48
hours to prepare a carrier film including a second adhesive layer
having a thickness of 5 .mu.m.
[0133] (3) Manufacture of OLED Lower Part Protection Film
[0134] The base film and the carrier film that are laminated with
the liner film were laminated at 25.degree. C. by using a roll
laminator to manufacture an OLED lower part protection film.
Examples 2 Through 9 and Comparative Examples 1 Through 8
[0135] An OLED panel lower part protection film, as shown in Tables
1 through 3, was manufactured in the same manner as Example 1
except by modifying conditions such as the content of the
antistatic agent in the first adhesive composition and the second
adhesive composition, whether to perform antistatic treatment on
the first base material, the second base material, and the liner
film, or the like as shown in Tables 1 through 3.
Experimental Example 1
[0136] 1. Measurement of Reflectance
[0137] Regarding the lower part protection film for an OLED panel,
manufactured according to Examples and Comparative Examples, a
reflectance of the liner film, a reflectance of the base-carrier
film, and a reflectance of the lower part protection film for an
OLED panel were measured. In detail, by using a reflectance
measurement mode of a spectrophotometer (Konica Minolta, CM3700A),
an average of each of the reflectance of the liner film, the
reflectance of the base-carrier film, and the reflectance of the
lower part protection film for an OLED panel was measured at a
wavelength of 400 nm to 700 nm, and listed in Tables 1 through
3.
[0138] 2. Evaluation of Errors in Alignment Process
[0139] Errors in three alignment processes of aligning the lower
part protection film for an OLED panel, manufactured according to
each of Examples and Comparative Examples, with an OLED panel, were
evaluated as below, and listed in Tables 1 through 3.
[0140] 2-(1) Evaluation of Errors in First Alignment Process
[0141] In a process of aligning the lower part protection film for
an OLED panel, manufactured according to each of Examples and
Comparative Examples, with an OLED panel, errors in the first
alignment process were evaluated by marking--.smallcircle. when the
liner film was exfoliated by performing the exfoliation once and by
marking--x when the liner film was exfoliated by performing the
exfoliation twice or more in the operation of exfoliating the liner
film from the lower part protection film for an OLED panel. This
evaluation was performed 100 times and a ratio of errors during the
100 times is shown in Tables 1 through 3.
[0142] 2-(2) Evaluation of Errors in Second Alignment Process
[0143] In a process of aligning the lower part protection film for
an OLED panel, manufactured according to each of Examples and
Comparative Examples, with an OLED panel, errors in the second
alignment process were evaluated by marking--.smallcircle. when an
area deviating from the OLED panel, which is a surface to which an
object is to be attached, is 0.1% or less of the total area of the
base-carrier film and by marking--x when an area deviating from the
OLED panel, which is a surface to which an object is to be
attached, exceeds 0.1% of the total area of the base-carrier film
in the operation of attaching the base-carrier film, from which the
liner film is exfoliated. This evaluation was performed 100 times
and a ratio of errors during the 100 times is shown in Tables 1
through 3.
[0144] 2-(3) Evaluation of Errors in Third Alignment Process
[0145] In a process of aligning the lower part protection film for
an OLED panel, manufactured according to each of Examples and
Comparative Examples, with an OLED panel, errors in the third
alignment process were evaluated by marking--.smallcircle. when the
carrier film was exfoliated from the attached base-carrier film by
performing the exfoliation once and by marking--x when the carrier
film was exfoliated by performing the exfoliation twice or more in
the operation of exfoliating the carrier film from the attached
base-carrier film. This evaluation was performed 100 times and a
ratio of errors during the 100 times is shown in Tables 1 through
3.
TABLE-US-00001 TABLE 1 Division Example 1 Example 2 Example 3
Example 4 Example 5 first content of 2.5 1 4 2.5 2.5 adhesive
antistatic agent composition (part by weight) second content of
0.25 0.25 0.25 0.15 0.35 adhesive antistatic agent composition
(part by weight) whether lower surface of .smallcircle.
.smallcircle. .smallcircle. .smallcircle. .smallcircle. antistatic
first base treatment is material performed lower surface of
.smallcircle. .smallcircle. .smallcircle. .smallcircle.
.smallcircle. second base material upper surface of .smallcircle.
.smallcircle. .smallcircle. .smallcircle. .smallcircle. liner film
lower surface of .smallcircle. .smallcircle. .smallcircle.
.smallcircle. .smallcircle. liner film reflectance liner film(%)
8.2 8.2 8.2 8.2 8.2 base-carrier film(%) 10.1 11.8 9.3 11.2 9.6
reflectance ratio 1:1.23 1:1.44 1:1.13 1:1.37 1:1.17 of liner/
base-carrier lower part protection 12.9 15.3 12.1 14.9 12.3 film
for OLED panel (%) evaluation of first alignment(%) 1 1 1 1 1
errors in second 0 0 2 0 1 alignment alignment(%) process third
alignment(%) 0 0 1 0 1
TABLE-US-00002 TABLE 2 Example Example Example Example Comparative
Comparative Division 6 7 8 9 Example 1 Example 2 first content of
2.5 2.5 2.5 2.5 0.1 7 adhesive antistatic agent composition (part
by weight) second content of 0.25 0.25 0.25 0.25 0.25 0.25 adhesive
antistatic agent composition (part by weight) whether lower surface
x .smallcircle. .smallcircle. .smallcircle. .smallcircle.
.smallcircle. antistatic of first base treatment is material
performed lower surface .smallcircle. x .smallcircle. .smallcircle.
.smallcircle. .smallcircle. of second base material upper surface
.smallcircle. .smallcircle. x .smallcircle. .smallcircle.
.smallcircle. of liner film lower surface .smallcircle.
.smallcircle. .smallcircle. x .smallcircle. .smallcircle. of liner
film reflectance liner film(%) 8.2 8.2 3.8 4.1 8.2 8.2 base-carrier
5.4 5.8 10.1 10.1 14.1 6.8 film(%) reflectance ratio 1:0.66 1:0.71
1:2.65 1:2.46 1:1.72 1:0.83 of liner/base- carrier lower part 11.3
11.6 11.6 11.8 18.1 11.7 protection film for OLED panel (%)
evaluation first 1 1 8 9 1 1 of errors in alignment (%) alignment
second 8 7 0 0 5 9 process alignment (%) third 6 6 0 0 7 8
alignment (%)
TABLE-US-00003 TABLE 3 Comparative Comparative Comparative
Comparative Comparative Comparative Division Example 3 Example 4
Example 5 Example 6 Example 7 Example 8 first content of 2.5 2.5
2.5 2.5 1 4 adhesive antistatic composition agent (part by weight)
second content of 0.03 1 0.25 0.25 0.15 0.35 adhesive antistatic
composition agent (part by weight) whether lower .smallcircle.
.smallcircle. .smallcircle. x .smallcircle. .smallcircle.
antistatic surface of treatment is first base performed material
lower surface .smallcircle. .smallcircle. .smallcircle. x
.smallcircle. .smallcircle. of second base material upper surface
.smallcircle. .smallcircle. x .smallcircle. .smallcircle.
.smallcircle. of liner film lower surface .smallcircle.
.smallcircle. x .smallcircle. .smallcircle. .smallcircle. of liner
film reflectance liner film(%) 8.2 8.2 4.0 8.2 8.2 8.2 base-carrier
13.7 6.9 10.1 2.4 19.8 5.1 film(%) reflectance 1:1.67 1:0.84 1:2.53
1:0.29 1:2.41 1:0.62 ratio of liner/base- carrier lower part 17.9
11.8 11.6 9.9 22.1 10.9 protection film for OLED panel (%)
evaluation first 1 1 12 1 1 1 of errors in alignment (%) alignment
second 6 7 0 15 10 9 process alignment (%) third 7 10 0 16 9 7
alignment (%)
[0146] As shown in Tables 1 through 3,
[0147] Examples 1 through 5 that satisfy the preferable conditions
according to the present disclosure, which are related to the
content of the antistatic agent and whether relevant layers are
antistatic treated, showed significantly less errors in an
alignment process compared to Examples 6 through 9 and Comparative
Examples 1 through 8 where at least one of the above conditions was
omitted.
[0148] In detail, Example 1 in which the lower surface of the first
base material was antistatic treated showed fewer errors in an
alignment process compared to Example 6 in which the lower surface
of the first base material was not antistatic treated. Also,
Example 1 in which the lower surface of the second base material
was antistatic treated showed fewer errors in an alignment process
compared to Example 7 in which the lower surface of the second base
material was not antistatic treated.
[0149] Also, Example 1 in which the upper and lower surfaces of the
liner film were antistatic treated showed fewer errors in an
alignment process compared to Example 8 in which the upper surface
of the liner film was not antistatic treated and Example 9 in which
the lower surface of the liner film was not antistatic treated.
[0150] In addition, each of Examples 1 through 3 in which the
content of the antistatic agent included in the first adhesive
composition is within a preferable range according to the present
disclosure showed significantly fewer errors in an alignment
process compared to Comparative Examples 1 and 2 which did not meet
the condition of the content of the antistatic agent.
[0151] In addition, in each of Examples 1, 4, and 5 in which the
content of the antistatic agent included in the second adhesive
composition is within a preferable range according to the present
disclosure showed significantly fewer errors in an alignment
process compared to Comparative Examples 3 and 4 which did not meet
the condition of the content of the antistatic agent.
[0152] Also, Example 1 in which the upper and lower surfaces of the
liner film were antistatic treated showed significantly fewer
errors in an alignment process compared to Comparative Example 5 in
which both the upper and lower surfaces of the liner film were not
antistatic treated.
[0153] Also, Example 1 in which the lower surface of the first base
material and the lower surface of the second base material were
antistatic treated showed far fewer errors in an alignment process
compared to Comparative Example 6 in which the lower surface of the
first base material and the lower surface of the second base
material were not antistatic treated.
[0154] Also, Example 1 which satisfies both Conditions (1) and (2)
showed far fewer errors in an alignment process compared to
Comparative Examples 7 and 8 which do not satisfy Condition
(1).
Examples 10 Through 17
[0155] A lower part protection film for an OLED panel as shown in
Tables 4 and 5 was manufactured in the same manner as Example 1
except for by modifying conditions such as the weight average
molecular weight of the first main agent resin or the second main
agent resin and whether or not to perform release treatment on the
lower surface of the liner film as shown in Tables 4 and 5.
Experimental Example 2
[0156] 1. Evaluation of Releasing Force, Adhesion, and Exfoliation
Force
[0157] Regarding the lower part protection film for an OLED panel
manufactured according to Examples 1 and 10 through 17, a 1 inch
width of the lower part protection film for an OLED panel was cut
and then the lower part protection film was exfoliated at a rate of
40 mm per second at 180.degree. to measure a liner releasing force.
A 1 inch width of the lower part protection film for an OLED panel
was cut to remove the liner film. Then the lower part protection
film was attached to glass having a cleaned surface, and
exfoliated, after 24 hours, at a rate of 5 mm per second at
180.degree. to measure an adhesion of the first adhesive layer. A 1
inch width of the base-carrier film was cut and the carrier film
was exfoliated at a rate of 40 mm per second at 180.degree. to
measure an exfoliation force between the base film and the carrier
film. The measurement result is shown in Tables 4 and 5.
[0158] 2. Evaluation of Workability of Alignment Process
[0159] Workability of an operation of aligning the lower part
protection film for an OLED panel, manufactured according to
Examples 1 and 10 through 17, to an OLED panel, was evaluated.
[0160] In the first alignment process of exfoliating the liner film
from the lower part protection film for an OLED panel, when
exfoliating the liner film, workability of the first alignment
process was evaluated by marking--.largecircle. when only the liner
film was exfoliated and marking--X when exfoliation between the
base film and the carrier film was generated. Also, workability of
the carrier film removing operation (third alignment process) was
evaluated by marking--.largecircle. when the carrier film was
exfoliated by performing the exfoliation once and by marking--X
when the carrier film was exfoliated by performing the exfoliation
twice or more in the operation of exfoliating the carrier film from
the base-carrier film attached to the OLED panel. The evaluation
result is shown in Tables 4 and 5 below.
[0161] 3. Evaluation of Adhesive Performance of Lower Part
Protection Film for OLED Panel
[0162] The lower part protection film for an OLED panel
manufactured according to each of Examples 1 and 10 through 17 was
attached to an OLED panel at room temperature by using a roll
laminator, and after 24 hours, the lower part protection film for
an OLED panel was left at a temperature of 60.degree. C. and a
humidity of 90% and for 500 hours to identify whether the attached
lower part protection film was exfoliated. The adhesive performance
of the base film was evaluated by marking--.largecircle. when
exfoliation did not occur and marking--X when exfoliation occurred.
The evaluation result is shown in Tables 4 and 5.
TABLE-US-00004 TABLE 4 Division Example 1 Example 10 Example 11
Example 12 Example 13 whether lower surface of .smallcircle. x
.smallcircle. .smallcircle. .smallcircle. liner film is
release-treated weight average molecular 600,000 600,000 100,000
400,000 800,000 weight of first main agent resin weight average
molecular 100,000 100,000 100,000 100,000 100,000 weight of second
main agent resin releasing force of liner film (gf/in) 3.2 9.8 3.2
3.2 3.2 adhesion of first adhesive 1680 1680 207 1029 2263 layer
(gf/in) exfoliation force of base 6.6 6.6 6.6 6.6 6.6 film/carrier
film (gf/in) workability first .smallcircle. x .smallcircle.
.smallcircle. .smallcircle. alignment third .smallcircle.
.smallcircle. .smallcircle. .smallcircle. .smallcircle. alignment
adhesive performance of base film .smallcircle. .smallcircle. x
.smallcircle. .smallcircle.
TABLE-US-00005 TABLE 5 Example Example Example Example Division 14
15 16 17 whether lower surface of .smallcircle. .smallcircle.
.smallcircle. .smallcircle. liner film is release-treated weight
average molecular 600,000 600,000 600,000 600,000 weight of first
main agent resin weight average molecular 4,000 50,000 150,000
220,000 weight of second main agent resin releasing force of liner
film 3.2 3.2 3.2 3.2 (gf/in) adhesion of first adhesive 1680 1680
1680 1680 layer (gf/in) exfoliation force of base 1.3 4.1 8.8 12.2
film/carrier film (gf/in) workability first alignment x
.smallcircle. .smallcircle. .smallcircle. third alignment
.smallcircle. .smallcircle. .smallcircle. x adhesive performance of
.smallcircle. .smallcircle. .smallcircle. .smallcircle. base
film
[0163] As shown in Tables 4 and 5,
[0164] Examples 1, 12, 13, 15, and 16 that each satisfy the
conditions according to the present disclosure, which are related
to the weight average molecular weight of the main agent resins and
whether the lower surface of the liner film is release-treated,
showed excellent workability in the first and third alignment
processes and excellent adhesive performance of the base film
compared to Examples 10, 11, 14, and 17 where at least one of the
above conditions was omitted.
[0165] In detail, Example 1 in which the lower surface of the liner
film was release-treated showed excellent workability in the first
alignment process compared with Example 10 in which the lower
surface of the liner film was not release-treated.
[0166] Also, Examples 1, 12, and 13 that each satisfy the
preferable range of the weight average molecular weight of the
first main agent resin according to the present disclosure showed
excellent adhesive performance of the base film compared to Example
11 where the weight average molecular weight of the first main
agent resin was not met.
[0167] In addition, Examples 1, 15, and 16 that each satisfy the
preferable range of the weight average molecular weight of the
second main agent resin according to the present disclosure showed
excellent workability in the first alignment process compared to
Example 14 where the above condition was not met, and showed
excellent workability in the third alignment process compared to
Example 17.
[0168] While the present disclosure has been particularly shown and
described with reference to exemplary embodiments thereof, it is to
be understood that the present disclosure is not limited to the
disclosed exemplary embodiments. It will be understood by those
skilled in the art that various changes such as addition,
modification, elimination, or supplementation may be made therein
to easily suggest other embodiments, without departing from the
spirit and scope of the disclosure as defined by the appended
claims.
* * * * *